# 关键字参数

def func(a, b=5, c=10):
    print('a is', a, 'and b is', b, 'and c is', c)


func(12, 24)
# a is 12 and b is 24 and c is 10

func(12, c=12)
# a is 12 and b is 5 and c is 24

func(b=12, c=24, a=-1)
# a is -1 and b is 12 and c is 24
